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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbaf832d6938c1d4c9042b2b8b11e86a57c2ac282a6621693e0bf9c3c635c373' 
  AND token = 'srItx972c6HUGryUaZ/O9A/uZQi5tEeKEjvZCMjr0Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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