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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7dab5ec21e643ab3a9651c20179f548514c3b32f5dec93d8c9d992eaedba87' 
  AND token = 'vN77S7+J/JVlxfulPz/s4ZjOPujQe8bBP1rH9ujbl98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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