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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e53750d0a7c0a4d4383fd03f45e75e0197454c493ec2230e82e5d79c5d9367b' 
  AND token = 'flj2lZZ77GJMjb9xN+W5n952XmCYlb4bt2Mwqai1MYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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