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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966c9d9b5746c62df638973d32ca80f0dc8d9356ced75ea2143e02af0c6e827d' 
  AND token = 'vZzZQX/2//GjPD9yYatQCyUNCLDoXtHWqTRCl4gvD2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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