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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf70abe290077aa134bd720e6e0a26c15fb8a328a4e4ce9266f1af258852ad1' 
  AND token = 'M6BfgoZMcWlCK5zw9IiGBGw3bgL0rvLWTJ20iBT4bec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00154

JSON explain

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