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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1911e9b3bb3fe19e7ee4a1ead2c4534a71116e8bae57ce5aa2476218ac17a4a' 
  AND token = 'T75FQ2DHFHkedt0TQev+H7r3ZyUrKcc+k1nSOXgGcX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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