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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332456f97785a12d24788ad2e9440c93c614ec57e66dc58f91338dce65540d57' 
  AND token = 'iD8L8kG0tBN1ECCiuDgdG4LqcYyuQmWTQUBYRy4TPnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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