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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29695d00fe8de335d294dbf67b4417a878c3b76ab739a2a445e9a5051f9ae542' 
  AND token = 'eaO1eN8ooGTPDQsFmnAwrBBLhXg2xCIDHt159zC0uFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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