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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9aa6305f402f452df3feb26ad41a8fcf6b488ab54784c9a7645153cd489b529' 
  AND token = 'dDup/iVMfqihlx6bhaDMpRAbY7cTCN4UGWPS8GK6X9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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