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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd671e5aa1b8d43dee7bb6e5ad523b540c3103fe317130434f44a9f51e62e467c' 
  AND token = 'kgdA4qGmrXghS1PnOD7ilZ/0H6nrXUoYoY9JM0Pbdzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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