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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1fd301445710b67d116a4cb45582e10cfb7052fe1ac8a79bde532c6135b2fb' 
  AND token = 'XPUXcvH2Ul3jJEURd4PlIwrA3JOrzzo03aI9J1xn7NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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