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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615dc68ff93bba2ddfd447efa93d354fc60afec4ca4e6d91330da861bae2bd12' 
  AND token = '6mhQet1P4es15exIv6M6Cj6SLOhkVZdUXyQdG6GtT5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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