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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abbf1694df8c71a773d3b5230af766976a59360d0b5b18561d67c193bf64e1b' 
  AND token = '+TXD8px3LKzwHKRLOERy513zwIcKOEqQHR+k2BrFw9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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