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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0843a749e232c02d6b865ffbddfc65a269b53294714b0905493f1e2ed5c9701' 
  AND token = 'mwntwelaJWm4mcPOGyt7LI2KVAuokl/2GPKZPqAx5CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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