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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0bf53db960dfe06ab911f9b6a7a9fbc61015a209760bae296e1955374effd2' 
  AND token = '2KTEEhwlnnaEgsVg9uYzRPkP3pvi5janXjbheiB1dv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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