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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d37e119d3043c40a5260b41fccb8363b4e8568df30a8f2c931344b9149cc2f2' 
  AND token = 'cazIakyWKNB5bdkkhDlqlvMAobzcm8fYkz2YWe2/7x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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