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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf9b7e80678e0961c2b199ea363dcdd3744e0946ee5c7cba36534007e2235e9' 
  AND token = 'UMkY4/u8G437xj1Ohnv/jggcve3pa7cpCD2cYMU9us8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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