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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d9095f939b744c6b0caf603e2c89be4c4ed847b4e86cafa833cab3c091e97d' 
  AND token = '4UIDv4fJQ45jtrhIEo8pFhljQQjydXMt6fjTBassq3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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