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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2807eb4b98326f0f72cd1e6bc9629787d8de2f731d949afd0ef38f206b6741a0' 
  AND token = 'B6YCecPpmZDe5pRL4jQTAT5L9UWIQwMpByNXEm7eEH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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