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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b23be7ff16a28cca2c6d2ca21b0707b79c1794bab7dbdca4ebc3ba1185aace' 
  AND token = 'eTHCHCM4TlzzMbYjeNnYMdWDaIPD+HZY1DPTl5h2VcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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