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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f083c80c916cb4a1223c0a6f8d467e15c5ac8d008d36f624cb2b2c85f79282' 
  AND token = 'QFc4vajIxfNRl4cMop84dQzEagky3l0TVnhxxn4jmT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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