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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773817097b5fe02b89456c2804943acec9526cf2e5d7f995107207a7d2501b42' 
  AND token = 'rGPpOaiHjdKv5UZ4cT/5c6IWR3iYEcdZqXesS6j+QfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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