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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff68a437e7e84f31484c31e52c4fcbf1b1e3e1e86404d7d66eac530a274cc7af' 
  AND token = 'b17GnPSrJu6P1b+1rtod/I46eZa04aCrG7wISQZoBOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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