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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff50f9db4b0c1f976f0f90209de274bab0fee8d58ab0e51e57ae301a5099d2c' 
  AND token = 'TjGJab+iGC5NPcoFhovgwpn+HIAJxMq5Stn66RAb4jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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