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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f2c84146d7117e860f310e0c73a3cbe413455a96ca96066739c34cd73e8ee1' 
  AND token = 'nzsTIsL5zsAx81vGmSFC02vPGh0ckCUxaxyokJciK+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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