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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1af8bb0a5f722ca9975187082ee6effe637cfb43b544d978cb66592a5aea8ed' 
  AND token = 'fH7qsZdJkZuEZR9l0Gl83PhMvlca/mRFItk8FvoTIBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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