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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95929c51e8908e8a57146e518421ce130b09c16b563fafac4cf43d294c2f1a9' 
  AND token = 'GZC8sLLQgWk/Inlc8+lqE3x82KUyeTKFRSujbDkoJfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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