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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334182a91e91109ea6888752fe2c78a240d7853345aacd508fc21f27422e2b21' 
  AND token = 'AyhNIrgiIprjAl/YFMUlZkhyULc7MC3bGcBn3V1r6As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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