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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a64fe14317cb168096ac0069941e93215c62c5ef637b7d9495d7d18841c9d0d7' 
  AND token = 'xatkW/cWWiQEJKwdpshyPF3GzIviDCUPHlJeyhXX3X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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