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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca62e7990ef8a37a0f4cdbf7639266fa4a61ab924fc1d358f21fc2f7d38eeb2' 
  AND token = 'TmXm7xMdXr1TkzRPtIshT6ihTLN6osRLMljldRlsxJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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