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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cdfd2f70e27547f65503c8a2979c66c8a087bbb71f4de2fd1cac8d829d298c7' 
  AND token = 'BptdkJsirlEyOP0bNwbJgy6xVG5vSRLCqkzIQhP5eik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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