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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e9a619c09e66457ea87ee2752683d538211d4112e4231a7383b188e08de039' 
  AND token = 'eEYJCtcHHgh87pH5Gv4294Wo/eyuIynpNKtnmN+W/+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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