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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a519fa0d2524ca6951d44ae17b3ac54ae0d90b608ca45600425061959f729b' 
  AND token = 'MaYiGP/PO1pKPb6pA5RmCeyE8SW/d0xsxo9vz7n1o9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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