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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020c2d9bacc54eec72ec56b2d3ba77253bebe20a176af01aec2810cd015fdf56' 
  AND token = 'Oz9Cix22PYkFNfNvwEoUHA7LJ5jjP2UcCUxKs67btEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}