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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe3f51a39c3939a6d859f4686c2d6f36650599f038a72a7d51e7dc4562fb887' 
  AND token = 'EA+EK6nOFnBdCy0fEPK7i01QR+9e4sPshSxXNhhSH7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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