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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5545eb9e8d731e8c2b3438a3b20ec5db169cb50e63c6f74b93f17205216fd7' 
  AND token = '+T8DG233XrYh3Jdv0rTuynTVv2XQhVaDMs2g7M3TIcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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