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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f954dab31bc1c77dcb9c17cad05f2c27cb17b5cc8a2fb16a2e4af67eb4d356' 
  AND token = 'eFQF5BSeRyfcdkXsADaz2d8l25ZgC4CGKdA55kDuLlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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