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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a776b21edda7a86ea8b1b9099b93c03814e5bcb22d63d07927702a24d4776b' 
  AND token = 'bastuoGrSiHjeJ/S3i4N88+wcmZgpx4q9j7ZnUsiMjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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