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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5aaa69aeca82c6588712e522790baede275b098721451b9f0246a65c7304a3' 
  AND token = 'R6YSBkc6X/Mln6At4vyIqWlAYrA3zcIuWgVh8UTYoqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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