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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d71db01f040998662f267c8fdc103d789038af1a77f0461ceff7970f08ac94' 
  AND token = 'HvkHKg0dyfJbgxtmhF2oxpcwBQYPrCnVOFoymw8zq2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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