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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b3ae64b454820747e10d5d0b8b96c46abfffbc711977b3d3e98b98b6523143' 
  AND token = 'cqA9YayKO4mPCrKsvg/6RyMzQ9bho/E7URTAOb7Ghaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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