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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98c9f970367083ec2dea2e901a1039dbdc90fcfd29438b94631e61af983ab80' 
  AND token = 'yNP82P6wxazWroEvtKsHOSPV4D3L51/dQmtOD+N7Jsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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