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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0066bbf5171fb0f8c9c8f3b7646e0be3d3e8f54199851e159ccdd58f8c9edb31' 
  AND token = '/dRyn9JYvU6yLCc6TQIFIHL8NFvn9V1GQ/zGuo4YjQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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