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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1cd1eeb39224b4deea474e2536b189a70bccc416c24604c18aae48fd513be6' 
  AND token = 'KD7oPhESpt663GUMSJDGx0P84zRRJ4Knaw04aQGoUTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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