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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7197ab6f6ce4bbc356188a7cf3a64222dd6fdaf5296ee6253e802dc822d071' 
  AND token = 'dHP76IwA3oVOe1fm49RJb/tWZIYO6LkPv4eVy+ci3T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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