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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0daa1718eb305566562c5b3e7a1fc94c5d7ca90a73e3e4af794d02ce4216e0a7' 
  AND token = 'o35bxPNfNnTN1JhBbGaSkuEFcFWRTYbiXj2er6H19x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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