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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235275bf67a1a6ffb533e7d73e3768831976da98b8949aeb1e897fb35a071f07' 
  AND token = 't76f0vMAW3KH5aXQkRABITJHDdD6KwE0LNTBE5KNCwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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