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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43ceac3c4adc4044ee4d2cac67daf82ef5547e331b0d659beb6679645f76599' 
  AND token = 'snwmjPbBGkvytGoWWmwobtpqEZOA4qg+Q0QtdgPHA+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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