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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe137079271c1cf9d685197887910c51da187b7a4abe8de9347c97fe49ee0d1c' 
  AND token = 'LrjVQOIxyv24JfRFSqXvMeFKoROG84DWk4UafwpsPqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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