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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36900db77994d0b2867939d1ad5d4d185f71ad50400a95986815ef4cd1b6ca1a' 
  AND token = 'fk0cblEmYzC1awxBt4LdkkfrO7X0o5rqix6Cneqn5cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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