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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dee23ddcc32c6ce0f346b15bfa2ba86966f67ec21630d82066cce74a72d685' 
  AND token = 'PFDvBTLNc8suaxp3rASK7kAXdnQKrCEB6gkUhAOU8HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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