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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c1d1641c3a339c07dd1f35d5fff0acea63ab3cd3885c93cb91e2871d9f7473' 
  AND token = 'CI2djOZlJxclRHlaWc0mVICZkzYjC9No7xy3bLwPvAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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