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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7130b58a88183a3f895af5bf5d34aed8edc965cdc3c806486a88e121def7bea' 
  AND token = 'nt8fmwGfHyCoYTwI7xVfRhKDtoix82DRTduJAIZztBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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