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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1128d31be6f8f810ca6baea044eb52a2f559487f0bc2e88d26dc0ad84b9d854' 
  AND token = 'CoNJI6ROM/0zV1M6bkIcLVMokZcLhSvC1O1exWiVv98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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