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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10838305042c4de7b1a88d3da8346a3c889a8f0cf77b39d0687b5bd1e0d90d2a' 
  AND token = 'IfPdgB3yKYOYt4K2+EJdIEhKZx1r6wi+piDQQYfovpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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