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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af31fcff96b38d717ca3ee947bcea478d2427d50af16a412c17382ef9493963e' 
  AND token = '9nEiWHDJ9DEMzaekhJAPBFzogmw8IsrWH9N0nheX5Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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