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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03069621f7ffb96de79f4938f8f1cb44c02c0fca037feace9a12c3ed95c363a7' 
  AND token = 'jgei/ng4EnUVz9KnCFRMgivMt0mij4VMSJ+/9vh3G70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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