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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d078fa6b9054f5488cbf9832510f5fc2b3a2831b42060ae3e866ae950a3aef1' 
  AND token = '3Go6RpxTJoZoqvlHt6y5kp+0fVcy9TT2VuTqU3i9FPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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