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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1e793a9128e32f331fa17702b1245a86ac9ffc3aae3b473bd2d3fecd83e10b' 
  AND token = 'Jx2BBj9CIocmcBVvvuX0+RWvo+N2AkOGq2yMFOdBtbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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