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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88f076563d3fe617bb3f6a75aa68b53339c2ddfe841c9e509c886a0856526be' 
  AND token = '8GuuMoZIVeaVykVRCs9oRxw+q4A8yg2xFb5f3iOLIBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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