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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4109cfa4b3e9dda2c667ced0dd2877557ce191de26438f38597bf6cd04e18453' 
  AND token = 'puOXLO4Rk4QoVQi15f5/R+hQO/EQuAgIySDbCwO86ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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