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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee99f7033abc08e43708143d15157e9716dd6474046e4042c94a0541fb38ac2' 
  AND token = 'UjcrQRJPKRuzlc+8ESxDVPQmXm+PJbRTN7dkPY5ymQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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