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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943b18cc5dff80d3581b2345ddf16e32a71aacdb02e8f26b6d7cc6453c320c5a' 
  AND token = 'LLE4euhnEz6mmpRZbq86crh4vjqKgmPF3KKDNe2dMrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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