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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833c92164fa64ccda576cb34fa5491019536275ad6a39fbcb4a0841c426ff4ec' 
  AND token = 'xreJFMwGjZrDfijJHbNtnod0p+Ta9IXN1kSWeif8mpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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