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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58e13cf50ceadd483b970bbe1d1c5580e048e97a1abe938bfb63cd52b50cbe6' 
  AND token = 'RBUeW337eDmpHF9RfW+QioKQVywH3ylH9x89R8LMjoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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